Database source files are implicitly assigned the CCSID of the job when they are created, unless they have been explicitly assigned a CCSID value using the CCSID parameter on the Create Physical File (CRTPF) or Create Source Physical File (CRTSRCPF) command.
If the job CCSID is 65535, the job default CCSID (DFTCCSID) is used as the implicitly assigned CCSID. The job default CCSID is determined by the system language identifier value and the job DBCS-capable indicator.